Belgioioso is noted for its medieval castle, the seat of the Belgiojoso family. It is believed to have been the initiative of Galeazzo II, who had it built on the extensive landholdings of the Visconti family in the second half of the 14th century. Francis I of France was held there after the Battle of Pavia.
This historic monument now offers a stunning setting for public and private events, including weddings and company parties.
The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.